chromium/ui/views/focus/external_focus_tracker.h

// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_VIEWS_FOCUS_EXTERNAL_FOCUS_TRACKER_H_
#define UI_VIEWS_FOCUS_EXTERNAL_FOCUS_TRACKER_H_

#include <memory>

#include "base/memory/raw_ptr.h"
#include "ui/views/focus/focus_manager.h"

namespace views {

class View;
class ViewTracker;

// ExternalFocusTracker tracks the last focused view which belongs to the
// provided focus manager and is not either the provided parent view or one of
// its descendants. This is generally used if the parent view want to return
// focus to some other view once it is dismissed. The parent view and the focus
// manager must exist for the duration of the tracking. If the focus manager
// must be deleted before this object is deleted, make sure to call
// SetFocusManager(NULL) first.
//
// Typical use: When a view is added to the view hierarchy, it instantiates an
// ExternalFocusTracker and passes in itself and its focus manager. Then,
// when that view wants to return focus to the last focused view which is not
// itself and not a descandant of itself, (usually when it is being closed)
// it calls FocusLastFocusedExternalView.
class VIEWS_EXPORT ExternalFocusTracker : public FocusChangeListener { … };

}  // namespace views

#endif  // UI_VIEWS_FOCUS_EXTERNAL_FOCUS_TRACKER_H_